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/**************************************************************************
*
* Copyright 2007 Tungsten Graphics, Inc., Cedar Park, Texas.
* All Rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sub license, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice (including the
* next paragraph) shall be included in all copies or substantial portions
* of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.
* IN NO EVENT SHALL TUNGSTEN GRAPHICS AND/OR ITS SUPPLIERS BE LIABLE FOR
* ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
**************************************************************************/
/**
* Private data structures, etc for the draw module.
*/
/**
* Authors:
* Keith Whitwell <keith@tungstengraphics.com>
* Brian Paul
*/
#ifndef DRAW_PRIVATE_H
#define DRAW_PRIVATE_H
#include "main/glheader.h"
#include "pipe/p_state.h"
#include "pipe/p_defines.h"
#include "vf/vf.h"
/**
* Basic vertex info.
* Carry some useful information around with the vertices in the prim pipe.
*/
struct vertex_header {
GLuint clipmask:12;
GLuint edgeflag:1;
GLuint pad:19;
GLfloat clip[4];
GLfloat data[][4]; /* Note variable size */
};
#define MAX_VERTEX_SIZE ((2 + FRAG_ATTRIB_MAX) * 4 * sizeof(GLfloat))
/**
* Basic info for a point/line/triangle primitive.
*/
struct prim_header {
GLfloat det; /**< front/back face determinant */
GLuint reset_line_stipple:1;
GLuint edgeflags:3;
GLuint pad:28;
struct vertex_header *v[3]; /**< 1 to 3 vertex pointers */
};
struct draw_context;
/**
* Base class for all primitive drawing stages.
*/
struct draw_stage
{
struct draw_context *draw; /**< parent context */
struct draw_stage *next; /**< next stage in pipeline */
struct vertex_header **tmp;
GLuint nr_tmps;
void (*begin)( struct draw_stage * );
void (*point)( struct draw_stage *,
struct prim_header * );
void (*line)( struct draw_stage *,
struct prim_header * );
void (*tri)( struct draw_stage *,
struct prim_header * );
void (*end)( struct draw_stage * );
void (*reset_stipple_counter)( struct draw_stage * );
};
#define PRIM_QUEUE_LENGTH 16
#define VCACHE_SIZE 32
#define VCACHE_OVERFLOW 4
#define VS_QUEUE_LENGTH (VCACHE_SIZE + VCACHE_OVERFLOW + 1) /* can never fill up */
/**
* Private context for the drawing module.
*/
struct draw_context
{
struct {
struct draw_stage *first; /**< one of the following */
/* stages (in logical order) */
struct draw_stage *flatshade;
struct draw_stage *clip;
struct draw_stage *cull;
struct draw_stage *twoside;
struct draw_stage *offset;
struct draw_stage *unfilled;
struct draw_stage *setup; /* aka render/rasterize */
} pipeline;
/* pipe state that we need: */
struct pipe_setup_state setup;
struct pipe_viewport_state viewport;
/* Clip derived state:
*/
GLfloat plane[12][4];
GLuint nr_planes;
GLuint vf_attr_to_slot[PIPE_ATTRIB_MAX];
struct vf_attr_map attrs[VF_ATTRIB_MAX];
GLuint nr_attrs;
GLuint vertex_size; /**< in bytes */
struct vertex_fetch *vf;
GLubyte *verts;
GLuint nr_vertices;
GLboolean in_vb;
void *elts;
struct vertex_header *(*get_vertex)( struct draw_context *draw,
GLuint i );
/* Post-tnl vertex cache:
*/
struct {
GLuint referenced;
GLuint idx[VCACHE_SIZE + VCACHE_OVERFLOW];
struct vertex_header *vertex[VCACHE_SIZE + VCACHE_OVERFLOW];
GLuint overflow;
} vcache;
/* Vertex shader queue:
*/
struct {
struct {
GLuint elt;
struct vertex_header *dest;
} queue[VS_QUEUE_LENGTH];
GLuint queue_nr;
} vs;
/* Prim pipeline queue:
*/
struct {
/* Need to queue up primitives until their vertices have been
* transformed by a vs queue flush.
*/
struct prim_header queue[PRIM_QUEUE_LENGTH];
GLuint queue_nr;
} pq;
GLenum prim; /**< GL_POINTS, GL_LINE_STRIP, GL_QUADS, etc */
unsigned reduced_prim;
/* Helper for tnl:
*/
GLvector4f header;
};
extern struct draw_stage *draw_unfilled_stage( struct draw_context *context );
extern struct draw_stage *draw_twoside_stage( struct draw_context *context );
extern struct draw_stage *draw_offset_stage( struct draw_context *context );
extern struct draw_stage *draw_clip_stage( struct draw_context *context );
extern struct draw_stage *draw_flatshade_stage( struct draw_context *context );
extern struct draw_stage *draw_cull_stage( struct draw_context *context );
extern void draw_free_tmps( struct draw_stage *stage );
extern void draw_alloc_tmps( struct draw_stage *stage, GLuint nr );
/**
* Get a writeable copy of a vertex.
* \param stage drawing stage info
* \param vert the vertex to copy (source)
* \param idx index into stage's tmp[] array to put the copy (dest)
* \return pointer to the copied vertex
*/
static INLINE struct vertex_header *
dup_vert( struct draw_stage *stage,
const struct vertex_header *vert,
GLuint idx )
{
struct vertex_header *tmp = stage->tmp[idx];
memcpy(tmp, vert, stage->draw->vertex_size );
return tmp;
}
#endif /* DRAW_PRIVATE_H */
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